Version 4 SHEET 1 1560 688 WIRE -656 -240 -768 -240 WIRE -528 -240 -592 -240 WIRE -288 -240 -448 -240 WIRE -432 -144 -432 -160 WIRE -768 -128 -768 -240 WIRE -672 -128 -768 -128 WIRE -464 -128 -672 -128 WIRE -288 -112 -288 -240 WIRE -288 -112 -400 -112 WIRE 176 -112 176 -176 WIRE 176 -112 -288 -112 WIRE 1152 -112 176 -112 WIRE -464 -96 -576 -96 WIRE -768 -80 -768 -128 WIRE -672 -80 -672 -128 WIRE -432 -64 -432 -80 WIRE -768 16 -768 -16 WIRE -672 16 -672 0 WIRE -672 16 -768 16 WIRE -576 32 -576 -96 WIRE -480 32 -576 32 WIRE -288 32 -288 -112 WIRE -288 32 -400 32 WIRE 112 32 112 16 WIRE 240 32 240 16 WIRE -768 48 -768 16 WIRE -576 64 -576 32 WIRE 112 128 112 112 WIRE 240 128 240 112 WIRE -576 192 -576 144 WIRE -576 192 -736 192 WIRE -448 192 -576 192 WIRE 752 192 752 160 WIRE 992 192 752 192 WIRE -224 208 -240 208 WIRE -128 208 -160 208 WIRE -16 208 -48 208 WIRE -448 224 -448 192 WIRE 416 240 272 240 WIRE 992 240 992 192 WIRE 1152 240 1152 -112 WIRE -576 288 -576 192 WIRE 752 288 752 192 WIRE -736 304 -736 192 WIRE 352 304 352 288 WIRE -112 320 -112 304 WIRE 416 320 416 240 WIRE 416 320 384 320 WIRE -16 336 -16 208 WIRE -16 336 -80 336 WIRE 112 336 -16 336 WIRE 272 336 272 240 WIRE 272 336 192 336 WIRE 320 336 272 336 WIRE -448 352 -448 304 WIRE -448 352 -528 352 WIRE -384 352 -448 352 WIRE -240 352 -240 208 WIRE -240 352 -304 352 WIRE -144 352 -240 352 WIRE 560 352 560 320 WIRE 560 352 384 352 WIRE 640 352 560 352 WIRE 896 352 864 352 WIRE 1152 352 1152 320 WIRE 1152 352 960 352 WIRE -16 368 -80 368 WIRE 560 368 560 352 WIRE -448 384 -448 352 WIRE -16 384 -16 368 WIRE -112 400 -112 384 WIRE 352 400 352 368 WIRE 1152 400 1152 352 WIRE 640 448 608 448 WIRE 992 448 992 320 WIRE 992 448 864 448 WIRE 992 464 992 448 WIRE -16 480 -16 464 WIRE 64 480 -16 480 WIRE -736 496 -736 384 WIRE -576 496 -576 384 WIRE -576 496 -736 496 WIRE -448 496 -448 464 WIRE -448 496 -576 496 WIRE -16 512 -16 480 WIRE -576 544 -576 496 WIRE 560 576 560 432 WIRE 608 576 608 448 WIRE 608 576 560 576 WIRE 752 576 752 512 WIRE 752 576 608 576 WIRE 992 576 992 544 WIRE 992 576 752 576 WIRE 1152 576 1152 480 WIRE 1152 576 992 576 WIRE 752 608 752 576 WIRE -16 624 -16 592 FLAG 752 608 0 FLAG 112 128 0 FLAG 112 16 +5V FLAG 752 160 +5V FLAG 352 400 0 FLAG 352 288 +5V FLAG 240 128 0 FLAG 240 16 -5V FLAG -112 400 -5V FLAG -112 304 +5V FLAG -576 544 0 FLAG -432 -160 -5V FLAG -432 -64 +5V FLAG -768 48 0 FLAG -16 624 0 FLAG 176 -176 OUT FLAG 64 480 SET FLAG 560 320 OUTdc SYMBOL SpecialFunctions\\LTC1968 752 400 M0 SYMATTR InstName U1 SYMBOL cap 576 368 M0 SYMATTR InstName C1 SYMATTR Value 10n SYMBOL res 976 448 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res 976 224 R0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL voltage 112 16 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL cap 960 336 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 1µ SYMBOL res 1168 496 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL res 1136 224 R0 SYMATTR InstName R4 SYMATTR Value 2k SYMBOL Opamps\\LTC2054 352 336 M0 SYMATTR InstName U2 SYMBOL res 208 320 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL Opamps\\LT1632 -112 288 M0 SYMATTR InstName U3 SYMBOL voltage 240 16 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value -5 SYMBOL res -32 368 R0 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL res -32 192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 1k SYMBOL cap -160 192 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 1µ SYMBOL res -288 336 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 100k SYMBOL njf -528 288 M0 SYMATTR InstName J1 SYMATTR Value 2N4338 SYMBOL res -464 208 R0 SYMATTR InstName R9 SYMATTR Value 10k SYMBOL res -464 368 R0 SYMATTR InstName R10 SYMATTR Value 11.5k SYMBOL res -592 48 R0 SYMATTR InstName R11 SYMATTR Value 4.53k SYMBOL res -384 16 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 10k SYMBOL Opamps\\LT1632 -432 -48 M180 SYMATTR InstName U4 SYMBOL cap -784 -80 R0 SYMATTR InstName C4 SYMATTR Value 1n SYMBOL res -688 -96 R0 SYMATTR InstName R13 SYMATTR Value 1.62k SYMBOL cap -656 -224 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C5 SYMATTR Value 1n SYMBOL res -432 -256 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R14 SYMATTR Value 1.62k SYMBOL voltage -16 496 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 0.5 SYMBOL res -752 288 R0 SYMATTR InstName R15 SYMATTR Value 750 TEXT 656 328 Right 2 ;5 TEXT 656 424 Right 2 ;6 TEXT 792 496 Right 2 ;1 TEXT 856 328 Right 2 ;2 TEXT 856 424 Right 2 ;3 TEXT 792 304 Right 2 ;7 TEXT 332 80 Left 2 !.tran 10m startup TEXT 64 512 Left 2 ;VOUT(RMS) H" 3 " VSET; with 0V d" VSETd" 1V\nVOUT(RMS) H" 3 " VSET H" 3 " VOUT(DC) TEXT -272 -136 Left 2 ;f H" 1/2ÀRC H" 100kHz